Bevel-protractor.



L. J-. PELLAY.

BEVBL PROTRAGTOR.

APPLICATION FILED MAR. 21, 1910.

1 23,144, Patented Apr. 16, 1912.

2 SHEETS-15173! 2.

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COLUMBIA PLANOORAPH co., WASHINGTON. D. c.

LOUIS J. FELLAY, F PEORIA, ILLINOIS;

BEVEL-PROTRACTOR.

Application filed March 21, 1910.

Specification of Letters Patent.

Patented Apr. 16, 1912 Serial No. 550,811.

I To all whom it may concern:

. hereby declare that the following is a full,

clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the same.

This invention pertains to improvements in that type of machine tools known as protractors and relates more particularly to a bevel protractor or other similar tool having one of its parts, usually termed its head, made in two sections one of which is shiftable relative to the other in a direction perpendicular to its base line.

The primary object of the invention is to produce an instrument of the nature described having the usual advantages-in determining the angle that one surface bears to another, the further one of determining what these angles are when the surfaces are offset from one another or when they bear such a relation to one another that the edges of the scale, or straight edge, and the protractor-head cannot be placed squarely upon both surfaces.

Another object of the'invention is to provide an instrument, of the character named, by which the angle that one surface may bear to another, when offset may be determined and that the measurement of the offset can be read from said instrument.

Another object is that the amount of offset between two surfaces of a member will be indicated upon the instrument so that the extent of such offset may be read without the necessity of making measurements or computations.

The invention besides the above objects pertains to certain details of construction and arrangements of parts as will be fully set forth and form the subject matter of certain of the claims.

While the invention is susceptible of certain changes and modifications it is shown in one of its preferred forms in the drawings hereto attached and in which Figure 1 is an elevation of my improved beveled protractor. Fig. 2 shows, in perspective, one of the members of the protractor head. Fig. 3 shows, in perspective, another portion of the head. Fig. 4 is a plan of a part of the instrument, a portion being shown in section. Fig. 5 is a view of the opposite side of part of the instrument from that shown in Fig. 1. Fig. 6 is a section on line X X, Fig. 1, showing portions of the protractor-head in section and a clamping screw in connection therewith, and Fig. 7 .is a vertical section of certain parts shown in Fig. 6.

In the figures the protractonhead is shown in two portions indicated by the letters A and A, the former being provided with a central circular opening B to receive the circular protractor-part C after the manner of any of the usual forms of this class of instruments, the said portion A and the protractor thereby swinging about a common center or axis, there being a leveling-glass D, and screw F for securing the protractor relative to the head, while G is the usual steel straight-edge or scale carried in the part C and held by contact of any suitable means such as a screw, the head I of which is shown at C.

The purpose of my invention, as outlined in the objects, is to provide an adjustable member having two relatively adjustable working edges to be placed upon a piece of work by which to determine the relative angles of two surfaces when such surfaces are separated by a shoulder or offset. This is clearly shown in Fig. 1 wherein I have illustrated a piece of work I-I having a surface J lying at an angle to the surface K; the said surface J lying below the surface K leaving an offset or shoulder as at L. It often happens in machine practice that a piece of work of thisor a similar form is to be reproduced or that the-differentangles thereof must be known in order to make a part, or parts, fit it and it is an extremely difiicult matter to find these angles since it requires a complication of measurements and the careful manipulation of scales to determine the question. This requires considerable time and the chances of arriving at an incorrect conclusion are many. In view of this I have provided an adjustable member for the main portion of the protractor head A which is found for example, in the member A before referred to. The portion A of the head, as shown in Fig. 2, is provided with a plane surface M which is perpendicular to its base line or working surface indicated at a. In this surface is a slot N which is likewise perpendicular to said surface P being'perpendicular to its base line or working edge resting on the surface J of the work, Fig. 1 and jutting from said surface is a rib Qto lie within the slot N and act as a guide and to keep T the two portions of the head in proper alinement. Extending through the member A perpendicular to the plane of the surface P is a hole R to receive a clamping screw S having at one end a head T corresponding in form to the undercut portion 0 of the slot N and in which slot said head is adapted to move vertically. The outer end of the screw S is provided with a clamping nut U by which the two portions of the head can be firmly clamped in any adjustment. the member A is constructed to conform with the curve of the part A, as clearly shown in'Fig. 1, and when the member A is in its normal or raised position relative to the part A the bases of these two portions lie exactly flush as indicated by the broken lines in Fig. 5 and the instrument in this condition conforms exactly to the structure of the protractor ordinarily used.

In order to provide for a nice adjustment of the two parts upon a piece of work as in Fig. 1, I provide an adjusting screw at the top of the part A indicated at V which isscrew V will impart movement to the portion A to shift it relative to the member A and its manipulation, as illustrated in Fig. 1, will cause the portion A to be lowered upon the surface J of the work, the

scale G having been placed upon the surface K of the work to be measured. The exact adjustment having been found the nut U of the screw S is tightened to firmly hold the members A and A in adjustment. As in instruments of this kind the edge of the scale G is exactly perpendicular to a line ex-tending'throughthe axial center of The base ofthe protractor and the zero or degree mark thereon, and, being fixed relative to said protractor swings with the same. In adjusting the base of the part A and the scale G to the two surfaces J and K described thescale and the protractor O must move relative to the head A, A so that, as in all instruments of this kind, the difierence in the angles will be shown by the mark I) on said head as in Fig. 5. The angle being thus determined and shown, the measurement of the offset L is also determined by means of a scale a on the said head in the figure just referredto at the surface M, and a mark cl on the part A indicates the exact depth or measurement of said ofiset. The parts all having been clamped in rigid relation and removed from the work both measurements can now be read. The instrument can be used in all respects the same as one of the ordinary forms as has been stated hereinbefore and its ability to adapt itself to many other purposes due to the adjustment provided makes it of added value to the machinist.

While I employ two members A, C, movable relatively about a common axis, both of them having a working edge a and C respectively, one of said members carrying a movable part A, yet as distinguished from one of the devices of the art, which also has a movable part in one of the members, but which shifts towardand away from the center about which the member swings, my said movable part shifts in-a direction perpendicular to both the said working edges a and C when the latter are parallel to one another, so-that a measurement can be taken between and perpendicular to the base of saidpart and the working edge of one or both.

For the sake of brevity in the claims I shall employ the term working edge in referring to the edge a of the part A, the edge 0 of thescale C, and the straight base of the part A. I state this in order to clearly indicate in said claims what portions or edges are meant.

Having thus described my invention, I claim 1. A tool of the character described comprising in its construction two associated members adapted to swing relatively to one another about a common axis, one of them having a working edge as its base, and a part carried by the other of the members and having a working edge as its base, said part being adjustable upon the member carrying it, the plane of said edge or base having a direct-ion of movement perpendicular to the edge or. base of the first described member when said edges or bases lie parallel to one another.

2. A tool of'the character described comprisixig in its construction two associated members adapted to swing relatively to one another about a common axis, one oft-hem having a working edge as its base, one of said members also having an indicating mark, the other having a series of indicating marks to associate with the mark of the first, and a part carried by one of the members and provided with a working edge as its base and movable on the member that carries it in a line perpendicular to the plane of its own base and perpendicular also to the plane of the base of the other member when both bases lie parallel to one another.

3. A tool of the character described com prising in its construction two associated members adapted to swing relatively to one another about a common axis, one of them having a working edge as its base, a part carried by the other member and adapted for a sliding movement thereon and having a working edge as its base, the direction of movement of the part being perpendicular to the plane of its base and perpendicular to the plane of the base of the first described member when the planes of both bases lie parallel to one another, said part and the member carrying it each having an indicating mark to associate with each other.

4. A tool of the character described comprising in its construction two associated members adapted to swing relatively to one another about a common axis, one of them having a working edge as its base, one of said members also having an indicating mark, the other having a series of indicating marks to associate with the mark of the first, a part carried by one of the members and adapted for a sliding movement thereon and having a working edge as its base, the direction of movement of the part being perpendicular to the plane of its base and perpendicular to the plane of the base of the first described part when the planes of both bases lie parallel to one another, the said part and the member carrying it each having an indicating mark adapted to associate.

5. A tool of the character described comprising in its construction two associated members adapted to swing relatively to one another about a common axis and each provided with a working edge, a third member carried by and adjustable upon one of said members in a direction perpendicular to the working edge of that member, and itself having a working edge, and means to adjust said third member.

6. A tool of the character described comprising in its construction two associated members adapted to swing relatively to one another about a common axis, one of them having a working edge, a third member having a working edge carried by and adjustable upon one of said members in a direction perpendicular to the line of its said construction two associated members each having a straight working edge and adapted to swing relatively to one another about a common center whereby said edges can be placed at. an angle to one another, a third member carried by one of the members and having a straight working edge to coincide with that of the member carrying it, said third member adapted for an adjustment in a line perpendicular to the line of its said working edge, and means to adjust it.

8. In combination with a bevel protractor comprising a member having a working edge, a second member associated with the first and also having a working edge and adapted to swivel relatively to the first said member about a common axis, of a third member carried by one of the first members and having a straight working edge and adjustable relative to the member carrying it in a plane perpendicular to the axial line about which both the said first members swing and perpendicular to the line of its own working edge.

9. The combination in a bevel protractor comprising a member having astraight working edge as its base, a second member associated therewith to swing relative to it, a part carried by one of the members and adjustable relative to it and itself having a straight working edge, means to adjust the part in a plane perpendicular to the axial line about which the members swing, such adjustment being also in a direction perpendicular to the line of its own working edge, and indicating devices to denote the extent of the adjustment of the said part upon the member carrying it.

10. The combination in a bevel protractor comprising two associated members adapted to swing relatively, one of said members having a working edge, of a movable part carried by the other of the members and provided with a working edge, said part being adjustable on the member that carries it perpendicular to the axial line about which the members swing, the direction of adjustment of said part being also perpendicular to the line of its own working edge.

11. The combination with a bevel protractor comprising two associated members adapted to swivel on one another, one having a working edge, of a movable part carried by one of them and adjustable relatively thereto in a line perpendicular to the axial line on which the members swing, and itself having a working edge, a measurement scale carried by one of the last named parts, and an indicating mark on the other of the parts opposite said scale.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

12. The combination in a bevel protractor, of two associated members adapted to swing relatively to one another about a common axis, one of them having a working edge, and also having a scale concentric with said axis, the other having an indicating mark associated wit-h said scale, a device carried by the last named member and slidably adjustable thereon and also having a working edge, its direction of adjustment being parallel to a line extending through the axial center of the protractor and the said indicating mark.

13. The combination in a bevel protractor, of two associated members adapted to swing relatively to one another about a common axis, one of them having a working edge, a part carried by the other of them and adjustable thereon in a direction perpendicular to the axial line about which the members swing, and provided with a working edge, associated indicating devices on the two members and associated indicating devices on the parts and the member carrying it to indicate the extent of adjustment of the said part relative to the latter.

14. The combination with a bevel protractor comprising two associated members adapted to swing on one another on a common axis and provided with associated indicating devices and means for securing the members in adjustment, of a member carried by one of the first said members and slidably adjustable relative thereto, .a measurement scale on one of them, and an indicating mark on the other of them for the purpose set forth.

In testimony whereof I affix my signature, in presence of two witnesses.

LOUIS J. FELLAY.

Witnesses:

L. M. THURLow, E. J. ABnRsoL.

Washington, D. C. 

